Defect characterisation using pulsed eddy current thermography under transmission mode and NDT applications

Pan, Mengchun; He, Yunze; Tian, Guohui; Chen, Dixiang; Luo, Fei

doi:10.1016/j.ndteint.2012.08.007

Cited by 116 publications

(42 citation statements)

References 32 publications

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“…In contrast, Pan et al [85] employed the heat diffusion PECT Advances in Mechanical Engineering 7 Investigated the impact damage defects within the carbon fibre reinforced plastic (CFRP) using PECT and analyzed the relationship between divergence and transient thermal patterns as well as between divergence and impact energy…”

Section: Pulsed Eddy Current Thermography (Pect)mentioning

confidence: 99%

Defect Characterization Based on Eddy Current Technique: Technical Review

Ghoni

Dollah

Sulaiman

et al. 2014

Advances in Mechanical Engineering

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Eddy current testing is widely used for nondestructive evaluation of metallic structures in characterizing numerous types of defects occurring in various locations. It offers remarkable advantages over other nondestructive techniques because of its ease of implementation. This paper presents a technical review of Eddy current technique in various scope of defect detection. The first part presents Eddy current evaluation on various defects location and orientation such as steam generator tubes, stress crack corrosion, and fatigue cracks. The next section analyzes the use of pulsed Eddy current and pulsed Eddy current thermography as an alternative method for monitoring the growth of cracks with the aid of computational techniques for postsignal analysis.

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Section: Pulsed Eddy Current Thermography (Pect)mentioning

confidence: 99%

Defect Characterization Based on Eddy Current Technique: Technical Review

Ghoni

Dollah

Sulaiman

et al. 2014

Advances in Mechanical Engineering

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“…The combination of eddy currents heating up and thermal diffusion is conducive to detecting turbulence in conductive materials by analyzing the thermal patterns [12][13][14]. ECPT combines the advantages of pulsed eddy current (transient analysis and eddy current interpretation) and the merits of thermography (fast and high resolution), which has been widely used for damage detection in metallic alloys [15]. Recently, ECPT has been used in many defects detection applications such as crack detection of carbon fiber reinforced plastic materials, compressor blades, and fatigue cracks [16].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the relevant signal processing methods have been proposed in ECPT. The time to peak feature has been adopted for wall thinning assessment and inner defects characterization in ferromagnetic materials [15,17]. However, the transient response features are always susceptible to noise.…”

Section: Introductionmentioning

confidence: 99%

Pattern Deep Region Learning for Crack Detection in Thermography Diagnosis System

Gao

et al. 2018

Metals

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Eddy Current Pulsed Thermography is a crucial non-destructive testing technology which has a rapidly increasing range of applications for crack detection on metals. Although the unsupervised learning method has been widely adopted in thermal sequences processing, the research on supervised learning in crack detection remains unexplored. In this paper, we propose an end-to-end pattern, deep region learning structure to achieve precise crack detection and localization. The proposed structure integrates both time and spatial pattern mining for crack information with a deep region convolution neural network. Experiments on both artificial and natural cracks have shown attractive performance and verified the efficacy of the proposed structure.

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“…Xie et al stated that multiple defects on ferromagnetic or non-ferromagnetic metallic surfaces can be detected using ECPT [13]. ECPT has also been used to detect various defects in carbon fiber composites [14,15]. However, there has not been any report on the application of ECPT to detect surface defects on PDC bits.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on Eddy Current Pulsed Thermography to Detect Surface Cracks on the Tungsten Carbide Matrix of Polycrystalline Diamond Compact Bit

Gong

Zhang

et al. 2017

Applied Sciences

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Polycrystalline diamond compact (PDC) bits are commonly used drill bits in the petroleum drilling industry. Cracks often occur on the surface of a bit, which may result in the unexpected suspension of the drilling operation, or even accidents. Therefore, the detection of surface cracks on PDC bits is of great importance to ensure continuous drilling operation and to prevent accidents. However, it is extremely difficult to detect such cracks by visual inspection or other traditional nondestructive testing (NDT) techniques due to the small size of cracks and the irregular geometry of bits. As one emerging NDT technique, eddy current pulsed thermography (ECPT) can instantly detect surface cracks on metal parts with irregular geometry. In this study, the feasibility of ECPT of detecting surface cracks on the tungsten carbide matrix of PDC bits was investigated. A successive scanning detection mode is proposed to detect surface cracks by using ECPT with a low power heating excitation unit and small-size coils. The influence of excitation duration on the detection result was also investigated. In addition, principal component analysis (PCA) was employed to process the acquired IR image sequences to improve detection sensitivity. Finally, the whole shape of a crack was restored with processed images containing varied cracks segments. Based on the experimental results, we conclude that the surface cracks on the tungsten carbide matrix of PDC bit can be detected effectively and conveniently by ECPT in scanning mode with the aid of PCA.

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Defect characterisation using pulsed eddy current thermography under transmission mode and NDT applications

Cited by 116 publications

References 32 publications

Defect Characterization Based on Eddy Current Technique: Technical Review

Defect Characterization Based on Eddy Current Technique: Technical Review

Pattern Deep Region Learning for Crack Detection in Thermography Diagnosis System

An Investigation on Eddy Current Pulsed Thermography to Detect Surface Cracks on the Tungsten Carbide Matrix of Polycrystalline Diamond Compact Bit

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